Abstract
NIH-3T3 cells expressing elevated levels of the normal human c-Ha-ras proto-oncogene (c-ras) exhibit reduced platelet derived growth factor-stimulated phospholipase activity. Three clonal cell lines of NIH-3T3 cells expressing different levels of c-ras have been isolated and characterized. The level of c-ras expression correlates inversely with PDGF-stimulated phospholipase activity as monitored by prostaglandin E2 (PGE2) production. In addition, high levels of c-ras expression produce cells with morphological and biochemical characteristics indistinguishable from NIH-3T3 cells transformed by EJ-ras. These data suggest that abnormal c-ras expression can attenuate growth factor-stimulated phospholipase activity in NIH-3T3 cells, in a manner analogous to that observed in cells transformed by EJ-ras.
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